Valve for steam-engines.



No. 708,750. I 'Patented Sept. 9, I902.

, w. WRIGHT, I

' v'AL-vE- FOB STEAM names.

7 (Application filed Jan. .4, 1899. Rene'wed May 17, 1902. (No Model.) 2Shuts-Sheet I.

WITN'ESSES: INVENTOR fl/ff/f" W2) M ATTORNEYS n4: nonms FETER coy.mom-mum, WASHINGTON. n. c,

Pater fled Sept. 9, I902.

W; WRIGHT. VALVE FOR STEAM ENGINES. (Application filed Jim. 4, 1099.Bez'aewed May 17, 1902.

2 sheets-$0000 2.

(No Model.)

INVENTOR ATTORNEYS UNITED STATES PATENT OFFICE.

WILLIAM WRIGHT, OF BROOKLYN, NEW YORK, A SSIGNOR, BY MESNE ASSIGNMENTS,TO MARY E. WRIGHT, OF BROOKLYN, NEW YORK.

VALVE FOR STEAM-ENGINES.

SPECIFICATION forming part of Letters Patent No. 708,750, datedSeptember 9,- 1902.

Application filed January 4, 1899. Renewed May 17, 1902. Serial No.107,844. (No model.)

To all whom it may concern:

Be it known that 1, WILLIAM WRIGHT, a citizen of the United States,residing in the bor ough of Brooklyn, county of Kings, city of New York,and State'of New York, have invented certain new and useful Improvementsin Valves for Steam-Engines; and I do hereby declare the following to bea full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same.

My invention relates to valves, and particularly to improvements inrotary valves of the type commonly employed in Corliss and other dropcut-off steam-engines.

My invention consists in the novel construction of the valve and in thenovel combination, construction, and arrangement of the parts.

The objects of my invention are to obtain large area of port-openingwhen the valves are first opened without excessive travel of the valves,to provide a valve possessing this advantageand which may be substitutedfor the valves of engines already built without changing the valve-seatsof such engines, and to make the valve as simple, durable,-andinexpensive as possible. These objects are att ained in the inventionherein described, and illustrated in the drawings which accompany andform a part of this specification, in which the same reference-numeralsindicate the same or corresponding parts, and in which- Figure 1 is aside elevation and partialsection of the cylinder and valve-gear of aCorliss engine, the ends of the cylinder and the valves being shown insection; and Fig. 2 is a vertical transverse section of theenginecylinder through the center of one of the valve-chambers.

As the steam-valves of Corliss and other drop out off engines areordinarily constructed steam is admitted through but a single opening inthe valve. Since the valve of necessity opens gradually, theport-opening at the beginning of each stroke is comparatively small andcan be made sufficient for the purpose only by giving the valveexcessive travel; There is also considerable wear of the edges of theports, dneto tipping of the valve toward that edge at which steamenters. The valve herein described is so constructed as to provide twoopenings for the admission of steam, opening simultaneously, and soproviding ample port-opening at the beginning of each stroke withoutexcessive valve travel. The valve is also so constructed that it may besubstituted in engines already built for rotary valves of other typeswithout altering'the valve-seats of such engines.

In the drawings, l designates the enginecylinder; 2, its steam-chest;3,'its exhaust-receiver; 4, the wrist-plate of the valve-gear; 5

and 6, steam-admission valves, and 7 and 8 exhaust-valves. The valve-gear is of the type covered by a companion application for Lette'rsPatent'of even date herewith, but need notbe particularly described, asit operates the valves in the same manner as former drop cut-ohvalve-gears of the Corliss type, tripping the steam-admission valves atthe point of cut-oft as determined by the governor of the engine andpermitting suitable valveclosers or vacuum-ports 9 and 10 to close thevalves so tripped. In the valve-chamber of each of the admission-valvesis a port 11, lead- ,ing to the interior of the engine-cylinder, and

an opening 12, connecting said valve-chamber with the steam-chest 2.Each valve consists of a hollow cylinder 13, turned true inwith thecylinder-port 11, and in proximity thereto a second port 16, and theport-closer 14 has in its face a recess 17, adapted to connect the ports15 and 16 of the cylinder 13 the cylinder 13 the port 16 may be a simplerecess in the inner surface of the cylinder'13. The port-closer 14 hasits bearing in the valve cylinder 13, but is prevented from turning bydowels 18, Fig. 2, fitting within recesses in a the rear end of thevalve-chamber, and at the other end of the port-closer there may be aspring-washer 19 to press said port-closer toward the rear end of thevalve-chamber. The

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valve-cylinder 13 is closed at its front end and is provided with avalve-stem 20, passing through a suitable stuffing-box and carrying acrank-arm, by whichsaid valve-cylinder may be rotated back and forth.

In Fig. 1 valve 5 is shown in its open position and valve 6 in itsclosed position. \Vhen one of the valves is closed, the port 15 in itsrotating cylinder 13 is completely covered and closed by the port-closer14. To open the valve, its cylinder 13 is rotated to one side. Steamthen passes from the interior of the cylinder 13 around one edge of theport-closer 14 and through the port 15 into the engine-cylinder port 11and also through the port 16 of the cylinder 13 around the other edge ofthe port-closer and through the recess 17 therein into the port 15 ofthe cylinder 13 and so into the engine-cylinder port 11. These twoopenings for the admission of steam open simultaneously, and thereforeaiTord ample port-opening for the admission of steam at the beginning ofthe stroke with much less valve travel than that which it is necessaryto provide in order to enable a single-ported valve to provide an equalamount of port-opening at the beginning of the stroke.

The cylinder 13,with its port-closer 14, may be inserted into thevalve-chambers of engines already built and provided with singleportedvalves of the ordinary type without any change in the ports orvalve-seats. The only change required in the engine is the boring ofdowel-holes in the rear end of each valve-chamber to receive the dowelsof the port-closers 14, and this may be done very readily while theengine is in place.

It will be noted that there can be no wear of the edges of the port 15due to tipping of the port-eloser, for the steam presses equally on bothsides of said port-closer when the port 15 is open.

The exhaust-valves differ somewhat in construction from thesteam-valves, their construction being such that the pressure of steamin the cylinder tends to keep them tight, whereas the steam or admissionvalves are so constructed that the pressure of steam from the steamchesttends to keep them tight. Each exhaust-valve consists of a cylinder 13,having within it a port-closer 14. The port-closer, however, is notrecessed, but has a passage or port 17, and the angle subtended on theouter side of the cylinder 13 by the bridge of metal 21,separating theports 15 and 16 of cylinder 13, is the same as the angle subtended bythe portion of the portcloser 14 of the admission-valve which overlapsthe admission edge of the port 15that is to say, the lap of the valve isthe same in both cases. The exhaust-valve at the lefthand or front endof the cylinder is shown in the open position. Steam may pass from theport 16 directly into the exhaust-receiver 3 and also from port 16through ports 17 and 15 into the exhaust-receiver.

It is not necessary that the movable members of either of the valvesherein described viz., the members 12 or 13be a complete cylinder. Itmay have merely enough metal on each side of the port 15 to providebearing for the port-closer and to provide the required amount of lap inthe exhaust-valve; but I prefer that the moving member 13 shall becylindrical, as shown.

Having thus completely described my invention, what I claim, and desireto secure by Letters Patent, is-- 1. The combination of a valve-seat,valve, and stationary port-closer, the valve and valve-seat havingcoacting ports adapted to permit the passage of fluid past theport-closer in one position of the valve, and the portcloser adapted toclose a valve-port in one position of the valve, and having a port communicating with said valve-port and arranged to be opened by the valvewhen the latter moves to its open position, whereby the port in theport-closer forms an additional channel for the passage of fluid.

2. The combination of a cylindrical valvechamber, a hollow cylindricalvalve within the same, and a stationary port-closer within the valve,said valve and valve-chamber having coacting ports adapted to permit thepassage of fluid past the port-closer in one position of the valve, andthe port-closer adapted to close a valve-port in one position of thevalve, and havinga port communicating with said valve-port and arrangedto be opened by the valve when the latter moves to its open position,whereby the port in the port-closer forms an additional channel for thepassage of fluid.

3. The combination of a valve-seat, valve, and stationary portcloser,the valve and valve-seat having coacting ports adapted to permit thepassage of fluid past the port-closer in one position of the valve, andthe portcloser adapted to close a valve-port in one position of thevalve, and having a recess which communicates with said port and spans aportion of the valve on one side of said port when the valve moves toits open position, thereby affording an additional channel for thepassage of fluid.

4. The combination of a cylindrical valvechamber having admission andexit ports, a hollow cylindrical valve within said chamber likewisehaving admission and exit ports, and a stationary port-closer withinsaid valve adapted to close one of the 'ports thereof in one position ofthe valve, and having a recess which communicates with said port soclosed and spans the space between the ports of the valve when saidvalve moves to its open position, thereby affording an additionalchannel for the passage of fluid.

In testimony whereof I hereunto aillix my signature in the presence oftwo witnesses.

WILLIAM WVRIGHT.

Witnesses:

H. M. MARBLE, J. (J. SPRINGSTEEN.

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